Disassembly of chiral hydrogen-bonded frameworks into single-unit organometallic helices for enantioselective amyloid inhibition.

Chiral nanostructures hold transformative potential across diverse fields, yet their assembly construction remains hindered by the high entropic barrier of dissymmetric building units. Inspired by biological structural dynamics, we construct two chiral copper-based hydrogen-bonded frameworks [D(L)-Cu-crystals] via hydrogen-bonded assembly using chiral metal-organic helical as the building unit. Single-crystal X-ray diffraction elucidates hierarchical chirality evolution from asymmetric coordinations to helical chains and framework packing.

Near-infrared photon-triggered CH-to-CHOH conversion over plasmonic oxyselenides.

The direct oxidation of methane into methanol exploiting O as oxidant offers an ideal route for methane utilization. Although the reaction is strongly preferred in thermodynamics, conventional catalytic systems always demand intense energy input like high temperatures or high-energy photons (>2.8 eV) to conquer the large kinetic barrier in the conversion process.

Research pathways from tensegrity-related biological structures to tensegrity robots: a bibliometric analysis.

Tensegrity describes a structural principle featuring a self-stabilizing system that consists of continuous tension elements and discontinuous compression elements. This paper undertakes a comprehensive systematic review of the overall development status and defining characteristics of the tensegrity field, employing bibliometric analysis methods and adopting an evolutionary perspective. Based on data spanning a 35 year period on the tensegrity theme sourced from the Web of Science database, we conducted detailed analyses of annual publication trends, significant authors, research areas, journals and co-occurrence maps of author keywords.

Bismuth-Doped AgTe Colloidal Quantum Dots for High-Performance Shortwave-Infrared Photodetectors.

Recently, silver telluride (AgTe) colloidal quantum dots (QDs) have garnered significant attention in short-wave-infrared (SWIR) photodetection owing to their strong SWIR responsivity and environmental benignity. However, the SWIR AgTe QDs often suffer from their high defect density, leading to an unsatisfactory utilization efficiency of the photogenerated charge carriers. To address this challenge, here, we have developed bismuth-doped AgTe (Bi:AgTe) QDs via a hot-injection doping method.

Phylogenomic insights into historical biogeography and species delimitation of African Ampelocissus (Vitaceae).

Ampelocissus Planch. (Vitaceae) comprises c. 95 currently recognized species that are distributed across tropical and subtropical regions in Asia, Australia, continental Africa, Madagascar, and Central America.

Efficient Electro-Oxidation of Ethylene to 2-Chloroethanol on SnO Through Dual-Adsorbate Pathway.

Electrified 2-chloroethanol synthesis serves as a promising alternative to conventional ethylene oxidation with corrosive hypochlorous acid (HClO) and offers the opportunity for sustainable pharmaceutical production. However, the instability of locally generated HClO and the competing water oxidation largely limit the efficiency of this electrochemical process. Here we report a new reaction pathway involved in the ethylene oxidation toward 2-chloroethanol, featuring co-adsorbed chloride (*Cl) and hydroxide (*OH) species on a tin dioxide (SnO) anode.

Engineering high-density microcrystalline boundary with V-doped RuO for high-performance oxygen evolution in acid.

Designing efficient acidic oxygen evolution catalysts for proton exchange membrane water electrolyzers is challenging due to a trade-off between activity and stability. In this work, we construct high-density microcrystalline grain boundaries (GBs) with V-dopant in RuO matrix (GB-V-RuO). Our theoretical and experimental results indicate this is a highly active and acid-resistant OER catalyst.

Determination of ED and ED of Oliceridine combined with Propofol in inhibiting responses to gastroscope insertion: a biased coin up-and-down design.

Background: Gastroscopy is a common medical procedure, but the insertion of the endoscope often causes significant discomfort and anxiety in patients, necessitating effective sedation strategies. Traditional sedatives, such as propofol, are widely used for procedural sedation but can lead to adverse effects, including respiratory depression and cardiovascular instability at higher doses. Oliceridine, a novel opioid analgesic, has emerged as a potential alternative due to its biased agonist properties, which may provide effective analgesia with a more favorable side effect profile.

Chemoselective Hydrogenation of Halonitrobenzenes by Platinum Nanoparticles with Auxiliary Co-N Single Sites in Sandwiched Catalysts.

The chemoselective hydrogenation of halonitrobenzenes to haloanilines is of great importance but remains challenging to simultaneously achieve high catalytic activity, excellent selectivity, and good reusability, especially for -substituted substrates. This is due to the occurrence of hydrogenolysis of halogen groups, as well as the easy migration and aggregation of active species on the catalyst surface during the hydrogenation of nitro groups. In this study, we integrate Pt nanoparticles (NPs) with auxiliary Co-N single sites from a porphyrinic metal-organic framework [known as PCN-221(Co)] in a sandwiched nanostructure as a catalyst for the chemoselective hydrogenation of -halonitrobenzenes at 80 °C and 1 MPa H in a 50 mL batch microreactor.

Large-Area Ultrathin Covalent-Organic Framework Membranes for Surface-Enhanced Raman Scattering: Optimal Performance Through Thickness Control.

Exploration and construction of novel π-conjugated organic semiconductors with low cost, small background interference, and excellent performance as surface-enhanced Raman scattering (SERS) substrates is one of the current focuses for the development of SERS technology. Based on precise control over synthesis conditions, a series of large-area tetraphenylporphyrin-based 2D covalent-organic framework membranes (2D-porphyrin-COFs) with high uniformity and precisely controllable thickness are constructed as SERS substrates. The delicate balance among the intensity of the substrate interference, the degree of π-conjugation extension, and the proportion of the edge-on channels within the total exposed region results in the optimal SERS performance of ultrathin multilayer 2D-porphyrin-COFs with the thickness between 5.

Modeling, analysis and control of an inertial wave energy converter and hydraulic power take-off unit.

A wave energy converter (WEC) utilizing the inertial gyroscope coupled with a hydraulic power take-off (PTO) unit for energy transformation and application is investigated. The structure design of various components of WEC are introduced. Power is obtained by the dynamic response of the floating body under the excitation of wave energy, and converted into gyroscopic precession in the form of swing angle and torque, and directly to drive the hydraulic pump module of the hydraulic PTO system to output the hydraulic energy.

Trajectories of systemic immune inflammation index and mortality risk in patients with moderate-to-severe traumatic brain injury: a retrospective cohort study.

Background: Some studies have shown a strong link between the central nervous system and peripheral immune system, but the prognostic implications of dynamic peripheral immune-inflammatory responses in patients with traumatic brain injury (TBI) remain unclear. This study aimed to determine the dynamic trajectory patterns of the Systemic Immune Inflammation Index (SII) in patients with TBI and assess its association with all-cause hospital mortality.

Methods: This retrospective cohort study utilized a large public database of patients with TBI sourced from the eICU Collaborative Research Database (eICU-CRD).

Research on the Range of Stiffness Variation in a 2D Biomimetic Spinal Structure Based on Tensegrity Structures.

This paper presents a novel variable stiffness mechanism, namely the SBTDTS (Spinal Biomimetic Two-Dimensional Tensegrity Structure), which is constructed by integrating bioinspiration derived from biological spinal structures with the T-Bar mechanical design within tensegrity structures. A method for determining the torsional stiffness of the SBTDTS around a virtual rotational center is established based on parallel mechanism theory. The relationship between various structural parameters is analyzed through multiple sets of typical parameter combinations.

Linkage Engineering of Semiconductive Covalent-Organic Frameworks toward Room-Temperature Ppb-Level Selective Ammonia Sensing.

Rational design of molecular architectures is crucial for developing advanced materials such as covalent-organic frameworks (COFs) with excellent sensing performance. In this work, two isostructural COFs (β-keto-AnCOF and imine-AnCOF) with the same conjugated linkers but distinct linkages are constructed. Although both COFs have porous structure and semiconductor behavior conferred by the identical conjugated backbones, β-keto-AnCOF with ─C═O side groups exhibits superior room-temperature ammonia (NH) sensing performance than imine-AnCOF and even the state-of-the-art dynamic and commercial NH sensors, i.

Rapid and Large-Scale Synthesis of High-Crystalline Imide Covalent Organic Frameworks Accelerated by Self-Generated Water.

Imide covalent organic frameworks (COFs) are considered promising materials in various fields due to their exceptional stability, large surface area, and high porosity. However, current synthesis methods of imide COFs typically involve complex vacuum operations, large amounts of solvents, and long reaction times at high temperatures, limiting their scalability for industrial production. Herein, a facile self-accelerated strategy is developed for rapid, low-cost, and large-scale synthesis of eight imide COFs (SACOFs) under solvent-free, vacuum-free, and low-temperature conditions.

Ultralow Coordination Copper Sites Compartmentalized within Ordered Pores for Highly Efficient Electrosynthesis of -Propanol from CO.

Coordinatively unsaturated copper (Cu) has been demonstrated to be effective for electrifying CO reduction into C products by adjusting the coupling of C-C intermediates. Nevertheless, the intuitive impacts of ultralow coordination Cu sites on C products are scarcely elucidated due to the lack of synthetic recipes for Cu with low coordination numbers and its vulnerability to aggregation under reductive potentials. Herein, computational predictions revealed that Cu sites with higher levels of coordinative unsaturation favored the adsorption of C and C intermediates.

Coherent Exciton Spin Relaxation Dynamics and Exciton Polaron Character in Layered Two-Dimensional Lead-Halide Perovskites.

The quantum-well-like two-dimensional lead-halide perovskites exhibit strongly confined excitons due to the quantum confinement and reduced dielectric screening effect, which feature intriguing excitonic effects. The ionic nature of the perovskite crystal and the "softness" of the lattice induce the complex lattice dynamics. There are still open questions about how the soft lattices decorate the nature of excitons in these hybrid materials.

3D-Printed Hierarchical Nanostructured N-CoNiO NF Electrode for Efficient Concurrent Electrocatalytic Production of Hydrogen and Formate.

Replacing the oxygen evolution reaction with the alternative glycerol electro-oxidation reaction (GER) provides a promising strategy to enhance the efficiency of hydrogen production via water electrolysis while co-generating high-value chemicals. However, obtaining low-cost and efficient GER electrocatalysts remains a big challenge. Herein, a self-supported N-doped CoNiO nanoflakes (N-CoNiO NF) is proposed for efficient electrocatalytic oxidation of glycerol to formate.

Strong Magneto-Chiroptical Effects through Introducing Chiral Transition-Metal Complex Cations to Lead Halide.

The interplay between chirality with magnetism can break both the space and time inversion symmetry and have wide applications in information storage, photodetectors, multiferroics and spintronics. Herein, we report the chiral transition-metal complex cation-based lead halide, R-CDPB and S-CDPB. In contrast with the traditional chiral metal halides with organic cations, a novel strategy for chirality transfer from the transition-metal complex cation to the lead halide framework is developed.

Atomically engineered interfaces inducing bridging oxygen-mediated deprotonation for enhanced oxygen evolution in acidic conditions.

The development of efficient and stable electrocatalysts for water oxidation in acidic media is vital for the commercialization of the proton exchange membrane electrolyzers. In this work, we successfully construct Ru-O-Ir atomic interfaces for acidic oxygen evolution reaction (OER). The catalysts achieve overpotentials as low as 167, 300, and 390 mV at 10, 500, and 1500 mA cm in 0.

p-Type AgAuSe Quantum Dots.

Control over the carrier type of semiconductor quantum dots (QDs) is pivotal for their optoelectronic device applications, and it remains a nontrivial and challenging task. Herein, a facile doping strategy via K impurity exchange is proposed to convert the NIR n-type toxic heavy-metal-free AgAuSe (AAS) QDs to p-type. When the dopant reaches saturation at approximately 22.

Major-auxiliary cooperative metal pairs in MOFs enable cascade oxidation of KA oil to ε-caprolactone.

Direct oxidation of KA oil (the mixture of cyclohexanone and cyclohexanol) toward ε-caprolactone is in high demand yet hard to implement in need of juggling the activation of both methyne C-H bond of cyclohexanol and α-C-C bond of cyclohexanone. Here we demonstrate that in situ formed Cu-O active site, which originates from relay reaction at Ni(II) and Cu(I) pairs in a metal-organic framework (known as NiCu-MOF-74) with O and benzaldehyde (PhCHO), efficiently oxidizes KA oil toward ɛ-caprolactone along with good stability. Mechanism investigation discloses that the auxiliary Ni(II) site first adsorbs O for abstracting formyl hydrogen in PhCHO followed by transfer of PhCO· to react with another O over the major Cu(I) site, leading to formation of Cu-O and PhCOOH.

Novel Inorganic-Organic Dual-Photosensitizing Dinuclear-Metal Self-Assembly System for Efficient Artificial Photosynthesis without Sacrificial Electron Donors.

Owing to the unique synergistic effect, dinuclear-metal-molecule-catalysts (DMCs) show excellent performance in catalytic fields. However, for overall photocatalytic CO reaction (CORR), it is still a challenge to construct well-matched photosensitizer (PS) components for DMCs-based photocatalysts. Inorganic-quantum-dot PS possesses capacities of multiple exciton generation and catalyzing water oxidation but is incompatible with DMCs.